88PG8226A1-NFE1C000 Marvell, 88PG8226A1-NFE1C000 Datasheet - Page 23

• Manufacturer Part Number: 88PG8226A1-NFE1C000
• Manufacturer: Marvell

3.2.2
Figure 10: Serial Programmability
Copyright © 2008 Marvell
April 23, 2008, 2.00
Serial Programmability
The output voltage of the step-down switching regulator can also program by using 18-bit serial data
into the SDI pin.
For "0" pulse, the high is 0.25 μs +/- 50 ns
and the low period is 0.75 μs+/-150 ns
For "1" pulse, the high is 0.75 μs +/- 150 ns
and the low period is 0.25 μs+/-50 ns
The period of a pulse is 1 μs +/- 200 ns
V
LOW
Start
Pulse
"1"
"1" pulse
V
"0" pulse
Document Classification: Proprietary Information
HIGH
V
pulse
V
"0"
HIGH
Low
< 0.8V
> 1.4V
Pulse
"1"
Select
V
HIGH
Chip
pulse
"0"
V
LOW
Pulse
"1"
pulse
"0"
Registor
Address
pulse
"0"
The write operation :
1) Each write sequence needs 18 pulses to complete.
2) During a non -write operation , the input needs to be at V
3) In between two successive write operations , the SDI input needs to
be at V
Pulse
WRITE MODE
"1"
pulse
LOW
"0"
sequence
1
(<0.8V) for a minimum of 10 μs
st
BIT
D7
Write
7
BIT
D6
6
BIT
D5
5
DATA FIELD
Low for at least
BIT
D4
4
10 μs
BIT
D3
3
BIT
D2
2
Functional Description
Doc. No. MV-S103563-00 Rev. C
Output Voltage Settings
BIT
D1
1
BIT
D0
0
LOW
sequence
2
nd
Stop
Pulse
(<0.8V).
Write
"1"
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